JP2002105468A - Solid fuel and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid fuel comprising effectively using a waste corrugated board. SOLUTION: The solid fuel is obtained by rupturing the waste corrugated board to charge an agitating tank 10 with the resulting material, almost macerating while agitating it, mixing it with a size, according to demand, in a dehydrating and mixing tank 12, compression molding them using a molding tool 17, and drying the resulting waste corrugated board mass in a desired shape to obtain the solid fuel 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid fuel and a method for producing the same, and more particularly, to a solid fuel comprising waste cardboard and a method for producing the same.

[0002]

2. Description of the Related Art For example, Japanese Patent Application Laid-Open No. 5-295376 discloses an organic waste functional material in which an oxygen generating agent that generates oxygen by a chemical reaction is mixed into a dehydrated organic waste. Such an organic waste functional material generates oxygen when ignited to facilitate combustion, and when stored in soil or mixed with feed, gradually releases oxygen to easily decompose and ferment. Therefore, it can be used not only as a fuel similar to wood and charcoal, but also for various uses such as fertilizer and feed, and organic waste can be treated without causing pollution and used effectively.

[0003]

In order to provide various articles for physical distribution, a packaging box of a cardboard case made of cardboard is widely used. Such packaging boxes are recyclable, making it possible to recycle punched strips and used ones when punching corrugated cardboard sheets to produce corrugated cardboard again, thereby enabling repeated use,
That is, recycling becomes possible.

However, in the case of ordinary corrugated cardboard, incineration disposal treatment is performed at a considerable rate at present. However, corrugated cardboard is produced from relatively high-quality pulp, and has a feature that a large amount of calories are generated during combustion. Therefore, by effectively utilizing such corrugated cardboard waste, it is possible to produce high-quality fuel, but conventionally, its effective utilization has been scarcely made.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a solid fuel using waste cardboard and a method for producing the same.

[0006]

SUMMARY OF THE INVENTION A major invention relating to a solid fuel relates to a solid fuel obtained by substantially disaggregating and solidifying broken pieces of cardboard. Here, a sizing agent may be mixed in the solid fuel. Solid fuel has a density of 0.1
5 to 0.45 g / cm3, more preferably 0.24 to
It may be in the range of 0.40 g / cm3.

[0007] The invention relating to the manufacturing method comprises the steps of putting broken pieces of corrugated cardboard into water to substantially disintegrate, placing the substantially disintegrated corrugated cardboard in a mold, and press-forming while dewatering; And drying the corrugated cardboard. Here, a sizing agent may be added and mixed into the substantially disintegrated cardboard.
As the paste to be added and mixed, starch paste or vinyl acetate glue may be used. Further, the solid fuel produced by the above method may be fired and carbonized.

[0008]

FIG. 1 shows an outline of a manufacturing apparatus for manufacturing a solid fuel according to an embodiment of the present invention. This apparatus has a stirring tank 10. Stirring blades are provided in the stirring tank 10 so that broken pieces of waste cardboard put in by the stirring blades are substantially disintegrated. The stirring tank 10 is connected to a dewatering / mixing tank 12 via a communication pipe 11. Dehydration mixing tank 12
Is connected to a discharge pipe 13, and the discharge pipe 13 is used to discharge substantially disintegrated waste cardboard.

The mold 17 is moved so as to be received by the pouring tube 13. The molding die 17 is a molding die corresponding to the shape of the solid fuel. For example, here, the molding die 17 has a prismatic concave portion, and the prismatic solid fuel is molded by such a concave portion. Further, a pressing element 18 for pressing waste cardboard put into the molding die 17 and a molding die 1
And a pusher 19 for extruding waste cardboard solidified from 7. A conveyor 20 is arranged to receive and dry the solid fuel 25 extruded by the pusher 19.

In the case of producing a solid fuel by such an apparatus, a broken piece of corrugated cardboard is put into a stirring tank 10 and stirred in water by a stirring blade. As a result, the broken pieces of the cardboard are almost deflocculated to some extent, but the fibers have not been broken apart. In such a semi-dissolved state, the waste cardboard is supplied to the dewatering and mixing tank 12 through the communication pipe 11, and the paste is added in the dewatering and mixing tank 12. As the paste, starch paste or glue paste composed of vinyl acetate resin may be used. In addition, dewatering is performed in the mixing tank 12, so that some water is separated.

The waste corrugated cardboard to which the glue has been added and which has been dewatered is poured into a molding die 17 by a pouring tube 13.
Then, the waste cardboard in the molding die 17 is pressed and solidified by the pressing element 18. Then, the solidified cardboard is extruded by a pusher 19 and transferred onto a conveyor belt 20. The conveyor belt 20 is provided with a drying unit (not shown) for drying and solidifying waste solids from the corrugated cardboard. When the drying unit is dried, a solid fuel 25 having a prism shape is obtained.

The broken pieces of the cardboard put into the stirring tank 10 may be collected cardboard for disposal, that is, a cardboard constituting a used cardboard case. Alternatively, it may be a punching waste when punching out a corrugated cardboard box to produce a corrugated cardboard box. Such a waste cardboard is broken by a breaker to a size smaller than a predetermined size. Accordingly, the solid fuel 25 having a prismatic shape can be obtained by such broken pieces of the waste corrugated cardboard material.

Such a solid fuel 25 is preferably used as an auxiliary material in a refuse treatment plant. It is also used as fuel for power generation boilers. In this case, power is generated using the energy generated by the combustion. Further, by firing such a solid fuel 25 in an atmosphere containing no oxygen, it becomes possible to produce coal having substantially the same shape as the solid fuel 25. Therefore, the solid fuel 25 can be made into charcoal and used as fuel, or can be used as an adsorbent.

[0014]

EXAMPLES Examples 1 to 6 In these examples, finely broken waste cardboard was used as a raw material, and starch paste was added to such fine waste cardboard, whereby a solid fuel as shown in Table 1 was obtained. Manufactured. Such a solid fuel has a density of 0.28 to 0.2.
It had a value of 38 g / cm3.

Examples 7 to 12 In these examples, a solid fuel was produced by adding starch paste to waste cardboard made of large broken pieces. The compositions of Examples 7 to 12 are shown in Table 2. The density of the solid fuel in these examples is in the range of 0.26-0.37 g / cm3.

Examples 13 to 18 In these examples, solid fuel was produced by adding vinyl acetate glue to finely broken waste cardboard. Table 3 shows the specifications of each embodiment. As is apparent from Table 3, the density of these solid fuels is 0.1.
The value was 28 to 0.38 g / cm3.

Examples 19 to 24 In these examples, a solid fuel was produced by adding vinyl acetate glue to waste cardboard broken into large dimensions. The composition ratio and the like are shown in Table 4. Table 4
As is clear from FIG.
It was in the range of 4-0.40.

Examples 25 to 27 In these examples, a solid fuel was produced by disintegrating a finely broken waste cardboard almost completely with water without using a glue. The specifications are shown in Table 5. As is clear from Table 5, the density of the solid fuel is 0.24 to 0.36 g /
cm3.

Examples 28 to 30 In these examples, the solid fuel was formed by substantially disintegrating the greatly broken waste cardboard into water. The specifications are as shown in Table 6. The density of the solid fuel in these examples was in the range of 0.26 to 0.38 g / cm3.

[0020]

[Table 1]

[0021]

[Table 2]

[0022]

[Table 3]

[0023]

[Table 4]

[0024]

[Table 5]

[0025]

[Table 6]

[Experimental Examples] Various experiments were conducted using the various solid fuels of Examples 1 to 30 described above. The results of these experiments are shown below.

EXPERIMENTAL EXAMPLE 1 Using the solid fuel mixed with the starch pastes of Examples 7, 8, and 9, the difference in burning time with respect to density was examined.
It was found that the higher the density, the longer the burning time.

Experimental Example 2 Using the solid fuels of Examples 10, 11, and 12 using starch paste, the difference in combustion temperature with respect to density was examined. It is apparent from FIG. 3 that the higher the density, the higher the combustion temperature. Became.

Experimental Example 3 The difference in burning time depending on the amount of the paste was examined for the solid fuels of Examples 3 and 6 in which starch paste was mixed. The results were as shown in FIG. As is clear from this result, it was found that the burning time was prolonged as the amount of the paste increased.

Experimental Example 4 With respect to the solid fuels of Examples 4 and 10 using starch paste, it was examined how the burning time differs between the case where the size of the broken pieces of the cardboard to be charged is large and the case where the size is small. As is clear from the data shown in FIG. 5, it was found that the smaller the size of the broken pieces of the cardboard, the longer the stabilization time at high temperatures.

Experimental Example 5 Using the solid fuels of Examples 19, 20, and 21 mixed with glue paste, the difference in burning time depending on the density was examined. FIG. 6 shows that the burning time was longer as the density was higher. It became clear.

Experimental Example 6 The difference in combustion temperature depending on the density of the solid fuel without glue of Examples 25, 26 and 27 was examined.
It was found that the higher the density, the higher the combustion temperature as shown in FIG.

Experimental Example 7 Using the solid fuels of Examples 21 and 24 mixed with glue paste, the difference in burning time due to the paste content was examined. As shown in FIG. Was found to have a long burning time.

EXPERIMENTAL EXAMPLE 8 The solid fuel of Examples 15 and 21 using glue glue was used to examine how the burning time changes with the size of the broken fragments. As shown in FIG. In addition, it was found that the smaller the size of the broken fragments, the longer the burning time and the more effective as a solid fuel.

Experimental Example 9 Using the solid fuel containing no glue of Examples 25 and 28 and examining the burning temperature and burning time with respect to the size of the fragment, the results shown in FIG. 10 were obtained. As is clear from these results, it was found that the smaller the size of the cardboard, the longer the burning time and the higher the burning temperature.

Experimental Example 10 The solid fuel of Example 9 having a large fragment using starch paste,
Example 30 in which large pieces were broken using glue glue and Example 30 in which the solid fuel was molded with large pieces without glue
The solid fuel of Example 9 was subjected to a combustion experiment, and the difference in the combustion time due to the comparison of the components was examined. As shown in FIG.
Although the solid fuel has the highest combustion temperature, the combustion time was short. On the other hand, it was found that the solid fuel of Example 24 stably burns for a long time though the combustion temperature was not so high.

From the above experimental examples, the solid fuel without the sizing burns better than the solid fuel with the sizing mixed therein. In addition, the lower the content of corrugated cardboard, the better the combustion. Further, it was found that the broken cardboard was easier to mold.

Further, in the combustion, it is better to form the air holes at the center and other places to perform better combustion. In addition, it was found that even when a glue was not necessarily mixed in, it was solidified when pressed with a mold.

[0038]

The present invention relates to a solid fuel obtained by substantially disintegrating and solidifying broken pieces of cardboard. Therefore, according to such a solid fuel, it is possible to obtain a solid fuel that effectively utilizes waste corrugated cardboard. Such a solid fuel is used as a fuel for a garbage disposal plant or a fuel for a power generation boiler.
Alternatively, it can be used as a raw material for charcoal. As a result, waste cardboard, which has been conventionally incinerated and discarded, can be effectively used.

The main invention relating to the production method includes a step of putting broken pieces of corrugated cardboard into water to substantially disintegrate, a step of placing the substantially disintegrated cardboard in a mold, and press-forming while dewatering; Drying the molded cardboard. Therefore, according to such a manufacturing method, a solid fuel can be obtained by disintegrating the waste corrugated cardboard substantially into water, solidifying it, and drying it. According to such a method, it is possible to easily produce a solid fuel made of waste cardboard.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing an outline of a manufacturing apparatus for manufacturing a solid fuel.

FIG. 2 is a graph showing the results of a combustion experiment.

FIG. 3 is a graph showing the results of a combustion experiment.

FIG. 4 is a graph showing the results of a combustion experiment.

FIG. 5 is a graph showing the results of a combustion experiment.

FIG. 6 is a graph showing the results of a combustion experiment.

FIG. 7 is a graph showing the results of a combustion experiment.

FIG. 8 is a graph showing the results of a combustion experiment.

FIG. 9 is a graph showing the results of a combustion experiment.

FIG. 10 is a graph showing the results of a combustion experiment.

FIG. 11 is a graph showing the results of a combustion experiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Stirring tank 11 Communication pipe 12 Dehydration mixing tank 13 Discharge pipe 17 Mold 18 Presser 19 Pusher 20 Conveyor belt 25 Solid fuel

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ryo Konishi 1-3-1 Uchisaiwaicho, Chiyoda-ku, Tokyo Tokan Kogyo Co., Ltd. F-term (reference) 4D004 AA12 BA03 CA14 CA26 CA42 CA50 CB15 CB26 CB46 CC20 4H012 HA00 4H015 AA01 AA12 AA17 AB01 AB03 BA09 BA13 BB03 BB05 CB01

Claims (8)

[Claims] 1. A solid fuel obtained by substantially disintegrating and solidifying broken pieces of cardboard. 2. The solid fuel according to claim 1, wherein a sizing agent is mixed. 3. The solid fuel according to claim 1, wherein the density is in the range of 0.15 to 0.45 g / cm 3. 4. A step of introducing broken pieces of cardboard into water to substantially disintegrate them, a step of placing the substantially disintegrated cardboards in a mold and press-forming while dewatering, and drying the pressure-formed cardboard. A method for producing a solid fuel, comprising: 5. The method for producing a solid fuel according to claim 4, wherein a sizing agent is added and mixed into the substantially disintegrated cardboard. 6. The method for producing a solid fuel according to claim 5, wherein the paste is starch paste. 7. The method for producing a solid fuel according to claim 5, wherein the glue is a vinyl acetate glue. 8. The method for producing a solid fuel according to claim 4, wherein the solidified solid fuel is fired and carbonized.